<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>动态表格</title>
	<style>
	  table{
	    border :1px solid;
		margin:auto;
		width:500px;
	  }
	  td,th{
	    text-align:center;
		border:1px solid;
	  }
	  div{
	    text-align:center;
		margin:50px;
	  }
	</style>
</head>
<body>
<div>
    <input type="text" id="id" placeholder="请输入编号">
    <input type="text" id="name" placeholder="请输入姓名">
    <input type="text" id="gender" placeholder="请输入性别">
    <input type="button" id="btu-add" value="添加">
</div>
<table>
    <caption>学生信息表</caption>
    <tr>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>操作</th>
    </tr>
        <td>1</td>
        <td>令狐冲</td>
        <td>男</td>
    <td><a href="">删除</a></td>
    <tr>
        <td>2</td>
        <td>任我行</td>
        <td>男</td>
        <td><a href="">删除</a></td>
    </tr>
    <tr>
        <td>3</td>
        <td>东方不败</td>
        <td>女</td>
        <td><a href="">删除</a></td>
    </tr>
</table>

<script>
   document.getElementById("btu-add").onclick=function(){
       var id=document.getElementById("id").value;
	   var name=document.getElementById("name").value;
	   var gender=document.getElementById("gender").value;
	   
		 var table=document.getElementsByTagName("table")[0];
		 table.innerHTML+="<tr>\n"+
		     " <td>"+id+"</td>\n"+
		      "<td>"+name+"</td>\n"+
			  "<td>"+gender+"</td>\n"+
			  "<td><a href="">删除</a></td>\n"+
		"</tr>";
   }
   
   
</script>
</body>
</html>